#include <iostream>
#include <cstring>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

// ./tcpclient serverip serverport
int main(int argc, char* argv[])
{
    if(argc != 3)
    {
        std::cerr << "Usage: " << argv[0] << "server_ip server_port" << std::endl;
        exit(0);
    }

    std::string server_ip = argv[1];
    uint16_t server_port = std::stoi(argv[2]);

    //1.创建socket
    int sockfd = ::socket(AF_INET, SOCK_STREAM, 0);
    if(sockfd < 0)
    {
        std::cerr << "create socket error" << std::endl;
        exit(1);
    }
    //2.connect
    struct sockaddr_in server;
    memset(&server, 0 , sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(server_port);
    ::inet_pton(AF_INET, server_ip.c_str(), &server.sin_addr.s_addr);
    int n = ::connect(sockfd, (struct sockaddr*)&server, sizeof(server));
    if(n < 0)
    {
        std::cerr << "connect socket error\n" << std::endl;
        exit(2);
    }

    while(true)
    {
        std::string message;
        std::cout << "Enter# ";
        std::getline(std::cin, message);
        write(sockfd, message.c_str(), message.size());

        char echo_buffer[1024];
        int n = ::read(sockfd, echo_buffer, sizeof(echo_buffer)-1);
        if(n > 0)
        {
            echo_buffer[n] = 0;
            std::cout << echo_buffer << std::endl;
        }
        else
        {
            break;
        }
    }
    ::close(sockfd);
    return 0;
}